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US 4,381,652 AGranted
Demand flow cryostat
AssigneeSanta Barbara Research Center
InventorWallace Y. Kunimoto
Life of this patent
Estimating the term…
Abstract
Demand flow cryostat 10 has an expansion nozzle 24 from which flow is controlled by valve needle 32. Bellows 34 regulates flow to maintain substantially constant temperature in the cooled space adjacent interior surface 26. Guide tube 38 and felt 44 control flow of the mixed liquid-vapor cryogen to stabilize temperature at the electronic device 30 which is cooled by the cryostat.
Claims7
A demand flow cryostat comprising:
- a tubular outer housing having a support thereon for supporting an electronic device to be cooled;
- an expansion nozzle directed toward said support, a tube connected to said expansion nozzle for delivering pressurized cryogen to said expansion nozzle;
- a valve needle positioned adjacent said expansion nozzle for controlling the outflow of pressurized cryogen from said expansion nozzle, a temperature sensor positioned to sense the temperature in the region to be cooled adjacent said support, said temperature sensor being connected to said valve needle in said nozzle to control the outflow of cryogen from said expansion nozzle to control the amount of cooling in the space to be cooled adjacent said support;
- and
- cryogen flow control means positioned around said expansion nozzle and within the space to be cooled adjacent said support for controlling the flow of cryogen away from said nozzle to stabilize temperature at said support, said flow control means comprising a perforated tube having an open end positioned around said nozzle with its open end directed toward said support and its perforations directed away from said support, said flow control means also including felt positioned within said outer housing and positioned against said support.
2 more elements
Dependencies are inferred from the claim text.